Photographic shutter



Jan. 29, 1929. 1,700,526

A. WOLLENSAK PHOTOGRAPHIC SHUTTER Filgd Aug. 25. 1 925 3 Sheets-Sheet 1 INVENTOR.

fizz/raw l VOZ has/1% BY 0 L 1 TTORNEY Jan. 29, 1929. 1,700,526

. A. WOLLENSAK PHOTOGRAPHIC SHUTTER Filed Aug. 25, 1925 3 Sheets-Sheet, 2

Z/mZrezd Wilensak Jan. 29, 1929. 1,700,526

A. WOLLENSAK PHOTOGRAPHI C SHUTTER Filed Aug. 25, 1925 5 Sheets-Sheet 3 Ana rem l l ollemsuk Patented Jan. 29, 1929.

l,7tlll,526

lJNlTEl) STATES PATENT ()FFlCE.

ANDREW WOLLENSAK, F HUGHES-TEE IQ'EYV YORK, ASEIGNOR T0 WOLLENSAK OPTICAL COMPANY,

OF ROCHESTER, NEW YORK, A GOREC'RATION OF NEW YGR-K.

PHOTOGRAPI-IIC SHUTTER.

Application filed August 25, 1925.

My present invention relates to photograph; .e. v v particularly to photographic h way. or as to certain of its ion is an improvement my prior pending ap- .i t No. 37.981, filed June 18, It has for its object to provide i111- pr cans tor regulating the speed of a sh e rs' hat shown in my said applio iprcw meansin connect-ion ll regu'. the diaghi in of the shutter. To these and other enos t invention resides in certain improvements and combinations of parts all as will be h ereiaaiiter more fully describeih the novel features being}; pointed out in the cit-Unis at the end of the s peci fication.

In the drawings:

Figure l is a front view of a photshutter constructed in accordance -ith illustrating one embodiment my invention.

Figure 2 a rear view thereof;

Figure 3 is an enlarged front View with the scale rin ren'io ed;

l ig'ure 4 is a front View with the scale ring aid cover plat removed showing the parts in a posit on wherein the blades are open for a time ezuoosure and the diaphragm is also raphic igure 5 is a detail section on the line 5-5 i col in ure 6 is a .so a View witn the scale and cover plate removed showing the parts in po- "oi a high speed exposure but with the nosed ront View snowing the dia *tainmo plate removed and usted for a slow or time eX- u' beii're; clos d; re 8 21 r with 1 upper plates wed she in position for a ctiiposure at the are about to be t +1 1 c m the la;

Mucous icli the hlades 'r to l igure 8 but parts removed showtaneous (X- T dos heinp; open;

w similar to Figure 9 but 11 closed position;

\lQW of one of the Serial No. 52,297.

Fi z ure 13 is a fragmentary perspective View of the master lever and Figure l l is a side View of the spring tension regulator for the master member spring.

Similar erence numerals throughout the several views indicate the same parts. The general operation of the shutter herein disclosed is the same as that of the shutter forth in my said pending application 9K- ccpt t at in die present case an iris diaphragm use-a to cut down or increase thelightadmis sicu. Referring in a general way to Figure l, the present embodiment of the invention is illustrated in connection with a shutter of the automatic type in which 7 is the operatng member and 2 indicates the time control 'ndicator while 3 indicates the diaphragm ad- 1 ins indicator. The indicators 2 and 3, esocctively, cooperate with time and diahragin scales l and 5 on a scale plate 6 se- My screws 7 to the front of an annular case 8. The scale plate is actually attached to a cover plate 9 best shown in Fig- This cover plate is secured to the shutter case 1 by screws 10. It has marginal flanges 11 fitting over the case and is also provided with a central collar 12 surroundthe lens opening.

On the under side of the cover plate 9 is a bearingin which turns a ring 13 of which the timing regulator 2 is a part. Diametrically opposite to the said indicator 2 on the ring is a spring stop 14 adapted to yieldingly latch with any one of a plurality of stop open inns 15 in the cover plate 9 corresponding to the readings on the scale l. In this way the indicator 2 is held at any one of the scale adjustments and controls the time and ins antaneous exposures accordingly in a man her that will be hereinafter described.

In t l a bottom or rear of the case is a recess 16 in which is mounted an annulus 17 having slots 18 to recei' e the pivots of an ordinary iris diaphragm ring; provided with an arm 19 terminating in the indicator 3 be fore referred to and the turning of which opens and closes the leaves 20 of the dia phra 'm. The arm 19 extends through a slot 21 in the case 1 to brings; the indicator 3 in position to overlie th periphery of the cover plate 9 and to project into proximity to the scale plate 6. Beneath the ring 13 and concentric therewith but secured to the casing 1 by screws :22 is a segmental plate 23 ares and 6.) It has a forwardly projecting collar 24 forming a bearing for the ring 13 which holds the latter close-to the cover plate 9 in which the openings 15 are formed. The ring 13 is resilient and as its indicator 2 is ad usted to different readings on the scale 4: of the scale plate 6, the lug l4 snaps into one or another of the recesses 15 in the cover plate 9 to give the different time adjustments hereinhei ore referred to and hereinafter described.

The cover platell acting in conjunction with the segmental plate also carries stop that controls the opening of the diaphragm ole res 20 through *he operating; arm 19, the purpose hen Y "not the diaphragm may he initially r a 1, me tact Jry tor a nr:

mum o tiening to which the i that the camera is fitted w For this purpose the provided with a segment (a adpistable a dog 26 he d nwardly ow turned 27 riding r ot :28 in e mounting plate 29 in the interior of the shutter. The diaphragm re plating arm 19 operating in its slot 21 in the casing): Y Jses between plates 28and 29, and the line r 2]" on the stop device, travelling in the ot constitutes an abutment that limits the movement of the diaphragm arm 19. A set screw 30 thr aded into the stop 26 b02275 neains i "the o or j w 'v torward surface o't plate and cl: 1t

against the same. This screw is set at the tactory during the initial assembl ng ol the shutter and is not supposed to be mere-af disturbed because as before said, it'liinit the opening movement of the diaphragm blades 20 as shown in Figures l and S, and also in Figure 3 to ive the proper n'izmlmum opening and light entranc :tor the A irticiiar lens used or the particular lens fitted to particular shutter, the lenses being apt to vary in this respect, tiat is, their capacity to transmit properly a volume of light refs .rl lier the adjustment is made a slot 31 in 1 1e cover plate 9 through which the adjustii screw 30 is preliminarily accessible is co pletely covered by the scale plate 6 .sl'iown h a comparison of Figures 1 and 8 and the i has no intimation that an adj t oi hind exists. He should not because he no proper occasion to "use it, it sentially a tee ory ed h,

i r t l hei ore statech a collar right hand blade is shown at It pivoted at 35 .Vlillllll the casin has a 36 across "from its of which it actuated.

8? and, throu lllOVQDlQi'lhF? and is prossi spend to or are coincident with a the bottom oi the ca sine l a master member engao' s t a recipr cate about to he described, ac; to open and close posi" member referred to eons annular member 39 having 10 adapted to be engaged by :1 i operating lever 7 I a y re-shape on end a lug on the rim that the operating lever z the master member in a clocl; V when the lever depressel as .sloe 8 hut will thereafter slip oil of tee s roengage when returned, the m st 1 being rte ient so tha 79 ls 2" tion anl the lug l0 be i the finger all will ride over it lover Y returns to the normal 1, 3 and 7 For instance. h e V 7 has a tendency to assume the norm tion of said figures through the inf a spring); 4-2 coiled al onti pivot and res '5 inst a h eral wall of the casing,

it t

c A arm ll 01 he operatri lever is also 0 wall, limit the the linger 41 has adapted to en 'sge the casi. movement at the arm after slipped oil of the lug 40.

7 and I spring" co the botton it the casing, W- mally holds the master member in tion of 10 that is, having 0- ter in a clock-wise direction, 5

master member to :11 extent that pin 38 to the top o is slot 21nd blades 34 closed as in mg 48, which l cooperates Wllil a ntal switch coin e19. Ass clearly sho 8 and 5) this switch oain ha" i l 1- curved bottom por llO top ano from the latter to if ovide a way is a comp!omentary curt indented portion 50 on a la fixed. The giiide way The normal relation of cams to the -Lll(l;-\"

in 7 and lOJwhereh is across its oe lug to hold the mast 'aised position and three hold the blades close When the operating lever l in Fig. 8 and the finger ll "he ly engages the lug; ll) or the the master member 39 member to the right 7 main-spring roe 1 V c ml "Lil passed its center however and is still urging the master member in an upward direction to hold the blades closed, the lug 48 moves on to the flat portion of the switch cam 49, which is at approximately the normal level thereof As the main-spring 46 is moved across its con ter and develops a tendency to thrust the master member downwardly and open the blades, it is prevented from doing so by the flat portion oi the cam until the operating member has progressed the master member srdiiciently for the lug 48 to slip off of the flat portion 49 and enter the guide-way 52, as shown in 8. The main-springbeing then fully wound and being in a position to exert its pressure downwardly instead of upwardly, carries the lug around in a segmental path through the guide-way 52, opening the blades inasmuch as the finger 41 on the operating lever '7 has, in the meantime, slipped ofit of the lug 46. As the spring crosses its center, as shown in Fig. 9, the blades are open because of the ma imum downward thrust on the master 1nember 89 at this point. Thereafter the tendency of the spring is in an upward direction and from the position'of Fig. 9 to that t Fig. 10 the spring raises the master member and closes the blades, the lug 48 resuming the initial position of Fig. 10.

In the practice of my present invention 1 provide means for supplementing the action of the main-spring 46 for the higher speeds of the shutter by furnishing an additional spring that adds its power to that of the spring 46 when desired. Furthermore I place the control of this supplemental spring and the extent to which it participates in the actuation of the master member 39 in the indicator lever 2. The supplemental spring is indicated at and is also wound about the post 47. One end either engages or remains in a position to engage the lug on the master member 39 along with spring 46. The other end is indicated at 54 and hoolrs over a regulating arm 55 which turns in a suitable pivot b airing on the post 47. It will be seen that by turir ing the lever 55 to the left the tension ot supplemental spring 53 will be reduced even to the point at which it will exert no pressure whatever upon the master member lug 45 while in turning it to the right as in Fig 9 it will add to the spring 46 a maximum or 1L3 own strength to that movement of the master member which opens and closes the blades after the master member is released by the operatin member. The inoperative position of soring :tor the lower speeds of the shutter is shown in Fig. 7.

The lever arm 55, for purposes of adjustment is provided With'a lug 56 which takes into a slot 57 in controlling lever 2. Therefore when controlling lever 2 is moved haclr and torth to diflerent adjusted positions in which the spring finger 14 thereon engages with the variousv slots 15 in the cover plate 9 as previcusly described, itmoves the arm 55 to place a greater or less or no tension upon supple mental so 53 and the speed oi? the shutter is acco dingly regulated with one or both springs in operation as the case may be.

There is a time-control. lever 58 provided having an arm adapted to be engaged by a separate finger 60 on the operatin lever *4 to throw a lug 61 on such tin'ie-lever into and out of the path of a lug 62 on the master member 39, as the master member and the time-lever are jointly moved through depressing; the operating lever. The time-lever pivoted at 63 and coiled about the pivot is a. spring 64 reacting against the shutter case at end and having other end engaging an arm on the time-lever so that it will t l to turn the timing lever in a clock-wise di ection to carry the lug 61 into the path or lug on the master member.

During the time exposure and when the operating lever 7 depressed the following; movements take piace: The operating leve: carries the lug 48 of the master member across the hat surface of the switch cam 49, as previously descrio ii. Vi hile it is doing so and he tore it has slipped off of the master member its 60 both depresses and releases the arm on the time-lever so that stop lug 61 on the latter moves baclr into guide-way 52 by the time that lug 48 on the master lever has dropped into the guide-way through the release of the master member by the operating lever. The result is that the return oi: the master lever under the influence of the mainspring is halted half way with the shutter blades open, as shown in Fi, by the engagement of lug 62, associated with lug 48 on the master member, with the lug 61 ot the stop lever. Upon again depre sing the operating lever 7, its first action is LU depress the time lever 58 and release the time stop 61 from engagement with the master member so that the latter returns to its initial position of Fig. 7 too early for the operating lever to engage it at all.

Of course, durin an lllI-jtttliillltOUS or automatically timed exposure, it is necessary to repress the action of this time-lever so that the master lever will return to normal posi tion in one movement instead or" with two movements. I accomplish this through the medium of the time-control ring 13 or? which the time-control indicator 2 forms apart. :3 previously described this tii'tlQ-C 'tiltlfil ring increases and diminishes the tension of the springs acting upon the master n'ieinber and. as there is no advantage in having a s spring action during a time exposi e it is advantageous to have the time ring act-u time-lever at the same time that it is It V ing the spring tension. I, therefore, pr the time-ring 13 with a cam, having onlarged portion 66 and a communica row portion 67 through which the tug the time-lever projects. lVhen the ring 13 is moved to the right, as in Fig. 6, to increase the tension of supplementary spring 53, previously described, the portion 67 or the ring holds lug 61 on the time-lever depressed, so that it cannot move into the path of the master member. .Vhen, however, the ring is moved in the opposite direction and the timecontrol indicator 2 is set for a time exposure, the Wide opening portion 66 of the cam thereon is presented in the path of lug G1 on the time-lever and the latter is thereby given such freedom oi movement that it may swing into and out of the path of the master member, as shown in e.

I claim as my invention 1. In a photographic shutter, the combination with a'blade mechanism, ot a master memberada-pted to actuate the same, a mainspring for moving the master member, a supplementary spring adapted to increase the spring tension on the master member and means for regulating the tension of the sup plementary spring.

2. In a photographic shutter, the combina tion with a blade mechanism and a master member for actuating the same, of a mainspring and an auxiliary spring tor moving the master member in one direction and means for moving the auxiliary spring into and out of contact With the maste member and for increasing and decreasing its tension.

3. In a photographic shutter, the combination With a blade mechanism, master member for actuating the same and an operating member for moving the master member in one direction, or post, a pair of springs coiled thereon and adapted to engage the master member to move it the other direction, and a device rotatable on the post and adapted to increase or decrease the tension of one of said springs.

In a photographic shutter, the combination with a blade mechanism and a master member for actuating the same, of a time stop, a controlling device therefor, a spring'adapt ed to act upon the master member and having its tension'controlled by the controlling member, a second spring also acting upon the master member independently of the first spring and of saio. controlling member:

5. In a photographic shutter, the combination With blade mechanism, a master member for actuating the same, a pair of springs adapted to act on the master member and a time stop for the latter, of a controlling device arranged to incrca 3 or decrease the tension of one of the springs and to also control the time stop.

6. In a photographic shutter, the combina tion With the blade mechanism, a master memher for actuating the same, a time stop for the master member and a post acent tothe latter, of spring coiled about said post to cooperate with the master-member at one end,

.means controlled by the movement an arm pivoted on said post and engaged by the other end of the spring to increase or diminish the tension thereof and means for adjusting the position of the arm, and also controlling the time stop.

7. In a photographic shutter, the combination With blade mechanism, a master member tor actuating the same, and a post adjacent to the latter, of a spring coiled about said post to cooperate With the master member at one end, an arm pivoted on said post and engaged by the other-end of the spring to in crease or diminish the tension thereof and means for nolding the arm in diitercnt posi tions oi adjustment.

8. In photographic Sl'lllttQi','tll6 combination with blade mechanism, a master member ior actuating the some, a time stop tor the latter and a post ad ent to the n member, of s1 a co d about the post nd having one e d adapted to the master member,-an arm pivoted on the post and engaged by the other end ot the spring to regulate its tension, and a wringing member operable from the exterior of the shutter to control the time stop and having sliding engagement With the arm to actuate it also.

9. In a photographic shutter, the combination with a blade mechanism, a master member tor actuating the same, a spring for actuating said master member and time stop movable into and out 01" the path of the master member, of a rotatable ring having a cam portion adapted, in one position of the ring to hold the time stop inoperative or out of said path, and provided with a cutaway portion adapted, in another position of the ring to permit freedom of movement of the time stop into the path of the master member, and means controlled by the movement of said rotatable ring for varying the tension of said spring.

10. In a photographic shutter, the combination of a shutter casing provided with a centrally arranged boss surrounding the lei s opening, blade mechanism, a master member for actuating the blade mechanism. aspring adapted to engage the master member and a tin'ie-regulating ring having a rotauive movement on the boss and adapted to vary the sion of the spring.

11. In a photographic shutter, the co nation of a shutter casing provided centrally arranged boss surrounding t. openin blade mechanism, a master tor actuating the blade mechanism, a adapted to engage the master men stop for the latter, a time regiv having a rotative movement on the bos provided With a cam portion arranged l. to control the position of the time stop, and

said regulating ring for varying the tension of said spring.

12. In a photographic shutter, the combb nation of a shutter casing, provided With a centrally arranged boss surrounding the lens opening, blade mechanism, a master member for actuating the blade mechanism" a spring adapted to engage the master member, a time stop for the latter, a cover plate for the easing having :1 plurality of stop openlngs therein and a time regulating ring having a rotating bearing on the boss and provided With a spring linger engaging the underside of the-cover plate and adapted to cooperate successively With the stop opening therein to hold the ring in different adjusted positions.

ANDREWV WVOLLENSAK. 

